The charge is Google has "tweaked" its search to avoid negative auto-completes on one of the candidates. By chance it is a candidate the head of google supports.
Will be interesting to see if this is considered "irrelevant" by the media or if it leads to serious questions about google manipulation of opinion under guise of "results".
Will it be provable? If so, will anything come of this? It's the kind of exploitation (if true) that leads to more and more regulations.